What is Mica ?
Mica is chemically a Potassium Aluminium silicate with a chemical formula [SiO2, Al2O3, K2O, Fe2O3, MgO, CaO, Hg2O] . It is described as faster dispersion, weather resistant, high degree insulation and aberration resistant.
India is the single largest source of mica in the world. The British Geological Survey reported that as of 2005, Koderma district in Jharkhand state in India had the largest deposits of mica in the world. China was the top producer of mica with almost a third of the global share, closely followed by the US, South Korea and Canada. Muscovite Mica is the best variety available from Rajasthan.
Mica is a group comprising almost 30 members that differentiate from each other, primarily, by atom substitutions or vacancies in the crystal lattice. From an industrial standpoint, very few are mined: Muscovite, white mica, is by far the most common, Phlogopite – a dark brown mica – comes in second. To a lesser extent, lithium mica such as Lepidolite find some interesting applications in our industries. Amongst platy minerals, micas are unique due to the broad range of particle sizes naturally available from microns up to several centimeters. Mica elementary crystals are three layer platy minerals: they consist of two tetrahedral sheets and one octahedral sheet.
The bonding strength between inter-layered cations and tetrahedral sheets, together with the steric effect, make the extraction of those cations almost impossible under standards conditions and gives all micas very high chemical and weathering stability. Under selected process routes, thorough delamination is achievable to the benefit of final applications where high levels of film reinforcement and/or barrier properties are expected. Depending on the nature of their origin, micas contain a variety of accessory minerals in addition to muscovite/ phlogopite. These minerals may include quartz, feldspar, kaolin and pyroxene.
The presence of these minerals in conjunction with the mica contained in the ore will impact upon both the industrial value of the deposit and the process complexity, reducing or increasing its value Mica deposits are either mined for mica only, when matrix yield is high enough, or in association with other minerals such as kaolin/feldspar.
When Mica is present in soft rock, it is beneficiated through wet processing, typically blunging, gravity separation and flotation. Mica is subsequently dried to attain a moisture content below 1%. In hard rocks, the preferred process is crushing, directly after drying, followed by sieving and magnetic separation. According to the final application, mica needs to be milled to the required particle size distribution and simultaneously delaminated to enhance its aspect ratio (particle diameter / thickness). This is obtained either through merely sieving (flakes form), or dry milling (into powder and micronized powder form) or wet milling for the most engineered grades with high smooth sheet surface and particle edges. Processor knowledge is critical in the balance of size reduction / delamination ratio.
For special applications, mica can be further calcined or surface treated (grafted with organic functions or coated with iron oxide) in order to enhance specific attributes such as compatibility with polar polymer matrix.
Mica is chemically a Potassium Aluminium silicate with a chemical formula [SiO2, Al2O3, K2O, Fe2O3, MgO, CaO, Hg2O]
Muscovite mica is another name (synonym) used to describe mica.
Mica is a dry sultry powder chemically inert, immune to climatic variations, non toxic, tough and water proof with excellent anti sticking property. Mica is highly responsive to the action of light, heat, and electrical energy.This makes Mica a very essential mineral in our day-to-day life.
It is used in paint, rubber, plastics, welding rods, printing materials, dry fire , extinguishers, greases, oil drilling, lubricants, glass & ceramic FLUX. Mica is also used in decorative coatings on wallpaper, concrete, stucco, and tile surfaces. It also is used as an ingredient in flux coatings on welding rods, in some special greases, and as coatings for core and mold release compounds, facing agents, and mold washes in foundry applications.
Dry-ground mica is used in automotive brake linings and clutch plates to reduce noise and vibration (asbestos substitute); as sound-absorbing insulation for coatings and polymer systems; in reinforcing additives for polymers to increase strength and stiffness and to improve stability to heat, chemicals, and ultraviolet (UV) radiation; in heat shields and temperature insulation; in industrial coating additive to decrease the permeability of moisture and hydrocarbons; and in polar polymer formulations to increase the strength of epoxies, nylons, and polyesters.
Mica is also used as an insulator in concrete block, home attics, and can be poured into walls (usually in retrofitting uninsulated open top walls). Mica may also be used as a soil conditioner, especially in potting soil mixes and in gardening plots. Greases used for axles are composed of a compound of fatty oils to which mica, tar or graphite is added to increase the durability of the grease and give it a better surface.
Physical Properties :
Mica Chemical Properties/Composition :
Mica Physical Properties :
|Appearance||White fine powder|
|Sp. gravity||: 2.7 – 2.9%|
|Bulk density||: 0.44|
|Oil obsorption||: 40 to 50%|
|Refractive index||: 1.57 to 1.59|
|PH of 10% aqueous solution||: 8.5|
|Hardness||: 2.5 (Mohs scale).|
|Volatile matter||: max 1.0%|
|Coarse particles on 400 mesh||: max 0.5%|
Industrial Applications :
- Pearl pigment: Pigment are coated with mica to make pearl pigments.
- Paper Industry : For making wall paper and coated paper.
- Paint Industry : To make good anti corrosive paint, primer, under coat, water based paints exterior coating, chemical resistant coating etc. Used in marine paints and aluminium paints. In the paint industry, ground mica is used as a pigment extender that also facilitates suspension, reduces chalking, prevents shrinking and shearing of the paint film, increases resistance of the paint film to water penetration and weathering, and brightens the tone of colored pigments. Mica also promotes paint adhesion in aqueous and oleoresinous formulations.
- Plastic Industry : Used in plastic Industry as a filler an mica improves electrical and thermal resistance and boost in insulation properties. Mica has innumerable uses in many industries like fire extinguishers, oil drilling, construction chemical, building material, lubricants, adhesives, and foundries. The plastics industry used dry-ground mica as an extender and filler, especially in parts for automobiles as lightweight insulation to suppress sound and vibration. Mica is used in plastic automobile fascia and fenders as a reinforcing material, providing improved mechanical properties and increased dimensional stability, stiffness, and strength. Mica-reinforced plastics also have high-heat dimensional stability, reduced warpage, and the best surface properties of any filled plastic composite.
- Well-drilling Industry : Ground mica is used in the well-drilling industry as an additive to drilling fluids. The coarsely ground mica flakes help prevent the loss of circulation by sealing porous sections of the drill hole.
- Rubber Industry : The rubber industry used ground mica as an inert filler and mold release compound in the manufacture of molded rubber products, such as tires and roofing. The platy texture acts as an antiblocking, antisticking agent. As a rubber additive, mica reduces gas permeation and improves resiliency.
- Fibre Cement: Mica is used in high engineered fibre cement to impart dimensional stability either in moisturizing conditions or in passive fire protection.
- Fire extinguisher: In this application, mica provides anti-caking & flow ability. This is vital, ensuring the dry powder will be properly and quickly blown out of the extinguisher tank.
- Foundry: Mica is used for coatings in iron casting and to a limited extent in aluminium production casting. It provides several properties both in the coating preparation – e.g. rheology & stability – and once applied on the inner mould surface: mica provides a constant thickness layer on vertical walls, anti-veining effect, and provides a barrier between the sand mould and the molten iron.
- Welding rods: Mica brings added value both during the rod manufacturing step (ease the extrusion) and the welding itself. During welding, the platy structure acts like a shield protecting the molten steel from ambient air oxidation and moisture.
- Automotive Industry : Micas in coarse and highly delaminated flakes are widely used in bitumen foils production that are attached onto the inner vehicle frame structures to dampen vibrations. They can be also applied in a spray form in less accessible areas. Thanks to its high thermal resistance and platy structure, mica is added to frictional systems to impart better heat transfer in conjunction with noise reduction in Brake pads & Clutches.
Mica Price in India (Our suggested Mica grades):
|Mica Grades / Model no.||VM – P200||VM – P300||VM – SF||VM – UF|
|Product Name||Industrial grade mica powder||Industrial grade mica powder fine||High grade mica flakes||Natural mica grounded flakes|
|Particle Size||200 mesh||300 mesh||Flakes||Flakes|
|Top cut (micron)||50 micron||40 micron||-||-|
|SiO2||51% – 54%||51% – 54%||51% – 52%||50% – 52%|
|Al2O3||30% to 32%||30% to 32%||30% to 31%||29% to 31%|
|CaO||> 1%||> 1%||> 1%||1%|
|Fe2O3||3% to 3.2%||3% to 3.2%||3% to 3.2%||3% to 3.5%|
|K2O||8% to 8.5%||8% to 8.5%||8% to 8.5%||8% to 9%|
|LOI||4% to 5%||4% to 5%||4% to 5%||4% to 6%|
|Applications||Paints, Plastics & Rubber industry; Oil well drilling; Automobile industry||for pearl pigment; Paper; Oil well drilling; Automobile industry||for pearl pigment; Paper; Oil well drilling; Automobile industry||Automobile industry; Paints, Plastics & Rubber industry; Oil well drilling|
We produce both high quality Mica flakes & powder as per client requirement .
|Packaging & Delivery Details:|
|Packaging:||50 kg pp bag; 1ton/bag; 1*20 container, can load 25-27 MT or upon clients’ requirement|
|Delivery:||within 5 – 20 days (depending upon the delivery location) after receiving the deposit|